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409TH Avenue over Drainage Ditch

Davison County, South Dakota · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

409TH Avenue over Drainage Ditch in Davison County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
It was built in 1920 and reconstructed in 1968, making it 105 years old at the 2025 inventory.
It carries about 149 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 60 of the 123 inventoried bridges in Davison County rated fair (48.8%); 22 (17.9%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	5	Fair condition


Structure	Continuous concrete culvert
Length	about 32 ft
Location	1.6 S Mitchell
NBI structure number	000000018150116
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.

Bridge	Built	Vehicles/day	Condition
Sanborn St (SD37) over BNSF RR	2001	13,545	Fair
Sanborn St (SD37) over Dry Run Ck	2001	13,545	Good
South Burr Street over Dry Run Ck	1990	11,950	Good
SD037 over I090	1966	10,351	Fair
SD037 over Dry Run Ck	1996	9,756	Good
SD037 over 4TH Ave BNSF RR	1997	7,642	Good